Classification of Storrs 1997

Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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G. †Plesiosaurus de la Beche and Conybeare 1821
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†Plesiosaurus dolichodeirus Conybeare 1824
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Invalid names: Plesiosaurus macromus Owen 1840 [synonym]
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Invalid names: Plesiosaurus brachypterygius Huene 1923 [synonym], Seeleyosaurus holzmadensis White 1940 [synonym]
†Plesiosaurus tournemirensis Sciau et al. 1990
Invalid names: Plesiosaurus priscus Parkinson 1822 [nomen dubium]
G. †Archaeonectrus Novozhilov 1964
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G. †Microcleidus Watson 1909
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G. †Attenborosaurus Bakker 1993
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Unr. Diapsida Osborn 1903 [diapsid]
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Unr. †Sauropterygia Owen 1859
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Invalid names: Eusauropterygia Tschanz 1989 [empty]